What action began the invasion of the western Roman Empire?

The Huns invading from the East

Explanation:

For the fall of Rome, it was the Huns invading from the east that caused the domino effect, they invaded (pushed into) the Goths, who then invaded (pushed into) the Roman Empire. The fall of the Western Roman Empire is a great lesson in cause and effect.

the hereditary right of a monarch to rule from the mandate of heaven

“a committee reviews the bill and marks it up to make it more viable and to reflect interests